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While it is not a very demanding application, it does take up some CPU and memory resources, so this probably was not helping my situation.
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One other recent change that I made to my system was the addition of Pi-Hole running in Container Station.
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Other existing jobs that covered my non-media data kept on running with no issues - but there had not been a sudden step increase in the data in those folders. Since my jobs only backup updated files, there had been very little data to upload to Backblaze ever since the original creation of my account there, but now there was a lot more upload activity required. The timing of the failures coincided with my adding a lot of new music files to that folder on my NAS. Just over a month ago I started to get failures on the job that backs up my music files. I set it up a couple of years ago, and the process has been pretty robust for that whole time. I've been using HBS3 to do nightly backups of the data on my TS-453D to both a local USB HDD docking station and online to Backblaze B2.
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