You would have to ask them - but the way that technology is moving I doubt that you would be able to read that data in 20 years time, never mind 100
While I have no clue about the softwares you mention I assume by "images" you mean picture files: if those are in a broadly known format (JPEG or PNG) then those formats can surely be still decoded in 50 years. I can halfway assure this, as in today picture formats from the 70s are still supported by selected software.
If by "files" you mean your entire installation (not only attachments): mostly yes, as they're more or less in plain text. Attachments depend on file types (I guess i.e. ZIP, JPEG and MP3 have more chances to still have enough knowledge left in 100 years to process them in contrast to i.e. RAR, 7Z, WEBP and DOCX. Database backup is plain text and understanding its logic in 100 years shouldn't be a problem. However, nobody knows if PHP or SQL in general is practiced/available in 100 years anymore to run your board.
More correctly and linked: M-DISC. In contrast to nowadays en vogue interfaces like USB and SATA (which are most likely outdated and unavailable in 100 years) a disc may be the better choice, although it's questionable if disc readers are still available in 2118 (and support both the structure and the file systems you're using). This problem is known to everyone who really thought about backup in full terms: keeping the data is not the only problem, but also being able to read and interpret it (speak: devices, software, knowledge).
Which is not only subject to time but also to temperature - since a time capsule is usually buried it implies that the ground has a lower temperature (which is better).
I doubt, even if you had the correct hardware and software, you will be able to read it. Half the time 3½” and 5¼” floppy disks couldn't be read between machines due to mechanical issues back in the day.
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