Measure before choosing storage
Use the provider’s storage report as a starting point, then check the size of the actual export. The two can differ: packages may compress text, include extra metadata, omit unsupported records or contain media already saved elsewhere. Photos, video, audio and attachments often dominate an archive’s size.
Keep room for both the original package and a working extraction, with space for growth. Do not treat a generic example as a measurement of your account. A large archive can also be split across several download parts; check that every expected part arrived.
Separate the waiting from the transfer
There are distinct stages: the provider prepares the export, you download it, you unpack and inspect it, and you make another copy. A faster connection does not remove a provider’s queue. Online backup depends on your upload speed, which may be much lower than download speed.
Sleep, throttling, a slow drive and many small files can extend the process. Check the provider’s expiry notice and leave enough time to retrieve all parts. A partly downloaded or synchronized folder is not a complete archive.
Keep a copy you can actually open
Retain the untouched provider package and a note of its date, selected scope and known gaps. Open samples from different dates, including important attachments or media. Keep an independent copy and verify it after transfer. If you encrypt it, keep the recovery information separately and test that you can use it.
A checksum can confirm that two copies contain the same bytes; it cannot establish that the provider included every record. An app-specific backup also needs its own restore requirements. These checks make the archive more useful without claiming perfect completeness.