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In the archives world (and libraries too) and IT btw, the rule with digital content (any) - is this:
1 - make at least 2 backups of your data, do it in timeline so short as you need, it can come to several times a day or once a day. Store one in the same building where you are, but not in the same room where you are and the other in a building away;
2 - state a cycle, in the worlds I’m talking about it is 5 years, and every 5 years check the supports where your files are and check the formats in witch they are. If one of these or both are disappearing, migrate the format to a new one, migrate the support to a new one.
It’s not 100% sure, but diminishes strongly the danger of loosing data, any data, being it your email files from 10 years ago, your audio in mp3 format, your word documents, or… your ebooks.
Best,
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