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Going only with Incremental ?

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How reliable is to perform a initial fulll backup and then go only with Incremental ? The documentaion says about the risk of data loss but how exactly ? Do people here do only incrementals ? Is it reliable ?
I'm evaluating Acronis and want to send the backed up files to Amazon S3 Glacier.

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Will, personally I would not rely on only ever making incremental backups - all backups require that an initial full backup be made, which depending on the size of the source data will be potentially very large.

Incremental backups will typically be much smaller depending on the volume of changes made to the source data, but every incremental is then dependent on the chain of backups that they form a part of.  

The default backup version chain size is normally around 7 backup files, i.e. an initial full backup image file followed by 6 incremental (or differential) backup image files, before a further full backup file is created to start a new version chain.

The risk with creating very large version chains, i.e. a chain of say 50 or more files, is that any damage or corruption to a single file within the chain will break the backup at that point in the chain, so if file #9 is damaged for any reason, the following 41 files in the chain have no value for recovering the backup chain.

I have experience of using Amazon S3 Glacier but you would need to create the backup files locally before attempting to upload these to that third-party cloud service - there are no options provided within the product to save backups directly to third-party services unless you can map that service to a local drive letter (such as can be done with Dropbox, OneDrive, Box etc).

I agree with the advice given by Steve. I would add that the longer the time between backups the fewer the number of incremental backups as the risks of loss are much higher the less frequent the backups are run.

On the system on which I have my critical data (on a Raid 5 array) I have three sets of backup tasks, one to a local disk, one to my NAS and one to Acronis Cloud. Each set contains a two incremental backups, the first runs every day and the second once a week.

Ian