Due to NAS issues, when I started a new time machine backup it did not have the old backups available. My question is do I need to delete them or will time machine automatically reclaim the space?  Only one Sparse Bundle, same name.

Due to NAS issues, when I started a new time machine backup it did not have the old backups available. My question is do I need to delete them or will time machine automatically reclaim the space?  There is only one sparse bundle but when I enter time machine I don't see my historic backups.  I use a synology DS212 for my time machine.  Started a new backup which is 218gb but it says 618 gb is occupied  therefore it looks like 2 or 3 backups are still on the disk. Before my NAS issues the last backup was in 2014.  As you can see there is a second sparse bundle from 2012.  Not sure what that is.

This is an old message now, but what happened to me similarly was:
I had a major computer crash and through complicated pathways ended up reinstalling (Mavericks) as a new user (long story).
At least I had good Time Machine backups on an NAS drive (Synology DS212j), or so I thought - when I started Time Machine up again, the old backup file was gone, replaced by a new one using my "new computer" name. The old file was gone both by directly mounting the NAS drive and by clicking "Enter Time Machine".
It's like I had {OldShareName}.sparsebundle and then it was replaced by {NewShareName}.sparsebundle, all of the old info vanished.
(I have spent a week finding old files elsewhere and have completed a satisfactory self-restore. It pays to "archive" [my own variation of] as well as "back-up".)
My belief is that if this were a wired-netword-drive, e.g. plugged right into my iMac with a USB cable, then the old file would have remained.
But this is an NAS drive, connected directly to my Airport wireless router, and I don't know the significance of the fact that it stores its Time Machine backups as "sparsebundle" files rather than simply as plain(er) files.
As usual when things get complicated with computers (not just Apple computers) there was never a warning message. Something like "YOU'RE ABOUT TO DELETE A TIME MACHINE BACK-UP FILE!!!" would have made my life a lot simpler.
BTW, I did try a "restore from Time Machine" option the first thing I had my "new computer" (old hardware, 2009 iMac) up and running, using Migration Assistant, and it ran for many hours and then failed in the wee hours - what that has to do with anything I'm not sure.
I'm not sure that I have a question about this other than "why do these things happen to me?", but it's a warning. Apart from that I've been very happy with the stability and reliability (but not the cost or set-up complexity) of NAS vs. directly-cabled external drives.
Charles

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