Don't trust the Cloud. Download local to Windows/Mac/Linux, don't rely on gadget. Then make backups (not on Flash, but plain HDD that's not helium, shingled or other fancy methods to increase storage). There is a longer story about backups to avoid trojans, ransom-ware, fire, flood and theft.
I'd certainly delete samples. I'd also like to be able to turn off "direct delivery" to the Kindle (app or ereader) which seems to happen if you "sync" even if you chose "Download to PC" initially.
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