You can uninstall Acronis Agent by starting the installation package and selecting Install Backup Client and then Remove or by running /usr/lib/Acronis/BackupAndRecovery/uninstall/uninstall. Should this way not work, you can uninstall Backup Client manually.

Follow these steps to completely delete Backup Client from your system:

1. Remove all modules from dkms:
# dkms status
snapapi26, 0.7.46, 2.6.9-1.667, i686: installed

# dkms remove -m snapapi26 -v 0.7.46 --all

2. Remove all Acronis RPMs (ignore all messages about the non-presence of packages):
# su
# rpm -v --rebuilddb --define="_rpmlock_path /var/lock/rpm"
# rpm -e --allmatches --nodeps AcronisAgentLinux
# rpm -e --allmatches --nodeps BackupAndRecoveryAgent
# rpm -e --allmatches --nodeps snapapi26_modules
# rpm -e --allmatches --nodeps snapapi_modules
# rpm -e --allmatches --nodeps dkms

3. Remove all files and folders related to Acronis software:
# rm -Rf /etc/Acronis
# rm -Rf /var/lib/Acronis
# rm -Rf /usr/lib/Acronis
# rm -Rf ~/.Acronis
# rm -Rf /usr/src/snapapi*