Best Practice for File&image -> Local&Cloud
Yes, your upstream bandwidth is unfortunately very slow. You mention both image and file backup plans. Running both on the same machines is fine if that's your need (to be able to restore entire volumes and / or restore a set of files). But you should not run them at the same time. In fact, We also need to clear up some terminology as it relates to both those types of backups (and I'm going to assume you are current on versions since some of these terms have changed in the product for file backup in the last 6 months or so).
1. Image backups need to perform a full backup (which backs up everything), followed by a number of incremental backups (which only back up changes since the previous backup), and then repeat the process.
2. File backups only back up all the files the very first time. Then from that point on, they either run incremental backups where all files that are changed are backed up in their entirety, or they run a block-level backup which only backs up the parts of the files that changed instead of the entire file. You can run a mix of these two types as needed - but block-level really only is useful on larger files that get small changes within them.
Your schedule for full image backups may be limited by bandwidth. You could consider only backing up the images to a local NAS and use hybrid backups for the file backups (assuming file backups cover the files on those machines that have image backups). That way you are not limited by bandwidth for image backups which can be large.
Either way you need to run full backup occasionally or you'll never be able to remove old backups from storage. There's no way to delete an old image backup until a new backup set (full) is started. But you could space out the full so they are less frequent. Say, every 30 or 60 days.
You also need to check your retention so you understand how long backups are being kept and make sure it fits your business needs.
Are these plans good or should I make different ones that are better?
Depends on what you need.There are no good or bad plans (within reason). There are plans that solve a business case and those that do meet the needs of the business. Without more information, it's hard to provide much guidance. And as I mentioned above, retention settings are important.
Is there a way to address bandwidth issues?
Avoiding image backup to the cloud if that meets the needs of the business. Ensure compression is enabled. Avoiding backing up any volumes or folders in the image backup that are not needed.