From the very beginning, Akeeba Backup and its predecessor JoomlaPack were designed to be absolutely private. You own your own data. We do not have access to your backups. We do not know how you've set up your backups. We do not know when you take backups. We do not know where you are storing your backups. We do not even know which sites you are using our software on. If anyone comes to us with a warrant or court order, all we can tell them is whether you're a client (if they give us an email address which matches our records) and when you downloaded our software, which is totally useless information. Nobody can compel us to give any information on you or your sites because we simply don't collect this information. We were doing what GDPR calls "data minimisation" long before GDPR was even a draft.
The downside to making an absolutely private backup solution that you manage yourself on your own sites is that we cannot answer the kind of questions you are asking. You are asking me to give you information we cannot have, should never have, and do not collect.
At best I can give you a workaround to find that information yourself.
Delete the folder plugins/system/matomo which, based on your error message, is what is throwing the error on your site. This would allow you to access your site's backend. Go to Akeeba Backup, Manage Backups. Check where the backups are; it tells you there. Make a note of that. Do that for all sites you are managing.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!