Time Machine won’t just backup your Mac, it will keep hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for each month, so you can recover an earlier
How to Connect External Hard Disk to Home Network over Feb 05, 2020 Time Machine keeps asking to create new backup? - Ask This will not get fixed until Time Machine re-engineer its approach and move away from using a remote-mounted disk image over the network. The problem lies due to network connections inherently being unreliable (more so wireless networks). However the file system (HFS+) was built for locally-attached disk and assumes that the connection is mostly reliable. Quick tip: Faster Time Machine backups - CNET Quick tip: Faster Time Machine backups. It may be that your Time Machine backups are being slowed down by Finder. Here is a quick tip on how to speed them back up.
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Solved: Slow Transfer Speeds on Synology NAS - Bob McKay's Sep 25, 2017 How do I use Time machine to back up my MAC onto a USB