Time machine for 2 Macs

Hi there
I just bought a WD 2T external disk and want to use half of it to backup 2 Macbook pro.
How I do it?
I want to keep about 1T to copy other stuff and leave 1 T for the time machine.
I don't know if i have to format it firstly and how, if i have to partition it? and if yes if it has to be in 2 or in 3 and how to do all this in the simplest way.
the disk is a simple external disk with only USB 2 as interface.
thnks for your help

Don't worry about what it means: just choose the 'Mac OS Extended (Journaled)' option in Disk Utility if you have to format the disk.
As to the sizes: the contents of your originals disks may well grow: and the TM backups grow much faster of course because of keeping all the changed files. If you do a lot of editing the backup can grow quite fast. Whatever size you choose, when the backup disk is full TM will start removing the olders versions.
If you don't partition, then the TM backups can expand to fill the space available: it depends on how much space you think you will need for your other data and how fast you think that will grow. Partitioning limits the maximum size of your TM backups; not partitioning may allow them to grow further at the expense of your other data capacity - or might allow that to expand to limit the siize of the TM backups. Either method should work fine, so it's up to you to think about it and decide which is most suited to your needs.

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