ReadyNas - Time Machine - Insufficient space

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Equitas wrote:

Recently, TIME MACHINE advised that it cannot connect to the NAS because there is insufficient space (the TM requires 350Gb)   I have not added significant data to my computer...so this is an issue.

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Wait. If the Time Machine quota set on the ReadyNAS is approached, Time Machine will let you know offering to purge older backups.  Anything else might indicate another possible problem - probably related to the inability to access the ReadyNAS admin portal.

If this is not a basic connection problem, have an eye there https://discussions.apple.com/thread/8270199

Equitas wrote:

When I look at the NAS on its portal (sometimes I can easily do it, sometimes the portal won't open...for instance, now, I can't open that portal...otherwise I'd take a screenshot and show you), I can see that I have 850Gb available.

This might indicate a potential issue on your ReadyNAS.

Equitas wrote:

 

HOWEVER, I do NOT see where the TM has been putting its data.  It just doesn't show on the ReadyNas.  The other files (movies, etc...) that I have there show.

Yes, that's correct. Time Machine does make use of sparse files, these form a kind of a container, which is mounted again as a macOS file system. The ReadyNAS can't deal with this proprietary data, neither with the file system nor with the TimeMachine specific organisation, and concurrent access would bring the data at risk. ReadyNAS does put the TIme Machine spare files in folders named to the username (for both shared and private Time Machines), here three private and a shared with it's default username. 

root@RN516:~# ls /data/.timemachine/
user1 user2 user2 ReadyNAS

Only the shell access does allow to see the allocated space, like...

root@RN516:~# du -s /data/.timemachine/ReadyNAS
8488480 /data/.timemachine/Public/