How Do I Stop Time Machine From Filling Up My External Hard Drive?

Question

Hi all -
I have a 750GB OWC external hard drive on which I back up about 100GB of data from my MacBook using Time Machine, and also store a bunch of media files for work. Currently about 650GB of that is full, and that is mostly because of two Time Machine-related files: The "Backups.backupdb" folder, which is 135.15GB, and "MacBook_001b63336000.sparsebundle," which is 233.71 GB. That means that in the nine months since I bought the drive, about 370GB, or half its available space, has been eaten by Time Machine backups.
I only back up so I have a bootable copy of all my current (not past) MacBook data if my MacBook is ever lost, stolen, or damaged. I am now very concerned that, if left unchecked, Time Machine will eat into the remaining 100GB of empty space. And my old external hard drive died precisely because it ran out of empty space. Some of my critical files were lost forever, and others I got back in pieces after several weeks of anguish and quite a bit of cash.
Apple's support page addresses this concern (incredibly) by instructing me to buy another external hard drive. That solution is expensive for me, and what's the point, when Time Machine will eventually fill that one up too?
So, my questions are:
1. Is there any point at which Time Machine recognizes it's nearly out of hard drive space, and either stops backing up, or deletes old backups, or sends me a warning, or something?
2. If not, is there a way I could designate a maximum size for Time Machine backups to take, such as 150 GB, that it cannot exceed?
3. Partitioning has been suggested, but I don't know how. Any instructions?
4. The OWC hard drive came with its own backup software. Should I just use that and shut up?
It would be mighty ironic if the software I use to save all my data got so fat, it sacrificed all my data....
Thanks in advance -

Answer 1

Andrew Saks wrote:
Hi all -
I have a 750GB OWC external hard drive on which I back up about 100GB of data from my MacBook using Time Machine, and also store a bunch of media files for work. Currently about 650GB of that is full, and that is mostly because of two Time Machine-related files: The "Backups.backupdb" folder, which is 135.15GB, and "MacBook_001b63336000.sparsebundle," which is 233.71 GB. That means that in the nine months since I bought the drive, about 370GB, or half its available space, has been eaten by Time Machine backups.
this is pretty confusing. have you been using it for both wireless and wired backups? the sparse bundle would only be created if you've used it for network backups. directly attached TM drives don't use a sparse bundle so it looks like you've got two separate backup lines. you should get rid of one as using both is very space inefficient.
I only back up so I have a bootable copy of all my current (not past) MacBook data if my MacBook is ever lost, stolen, or damaged.
FYI, TM backups are not bootable themselves. You can use the "full system restore from TM" utility on the leopard install DVd to restore your system from backups. That restored system will, of course be bootable.
I am now very concerned that, if left unchecked, Time Machine will eat into the remaining 100GB of empty space. And my old external hard drive died precisely because it ran out of empty space. Some of my critical files were lost forever, and others I got back in pieces after several weeks of anguish and quite a bit of cash.
Apple's support page addresses this concern (incredibly) by instructing me to buy another external hard drive. That solution is expensive for me, and what's the point, when Time Machine will eventually fill that one up too?
So, my questions are:
1. Is there any point at which Time Machine recognizes it's nearly out of hard drive space, and either stops backing up, or deletes old backups, or sends me a warning, or something?
I'm not sure of the precise point (TM need some free space on the backup drive to operate) but yes, this will eventually happen. when it does, TM will inform you of this and will give you an option of either stopping TM backups and changing the TM drive or starting to delete old backups. If you choose the latter it will start deleting old backups to create space for new ones. this is done automatically.
2. If not, is there a way I could designate a maximum size for Time Machine backups to take, such as 150 GB, that it cannot exceed?
not unless you partition the drive.
3. Partitioning has been suggested, but I don't know how.
it's an option but not right now. you have too little free space left for a successful partitioning process. If you try, the process is sure to fail due to disk fragmentation.
You need to get rid of A LOT of data if you want to try partitioning. also, fort the future, it's a very good idea to keep one partition entirely for TM and another for data. You'll avoid some of the problems you are having now.
Any instructions?
type "creating new volumes" in disk utility help.
4. The OWC hard drive came with its own backup software. Should I just use that and shut up?
don't. besides TM there are much better options out there. CCCloner and Superduper! are better than anything that OWC software has to offer.
It would be mighty ironic if the software I use to save all my data got so fat, it sacrificed all my data....
Thanks in advance -